Sounds like your compressor was seized up and by jumping it you forced the clutch to engage which probably made your serpentine belt squeal loudly and possibly smoke. It's probably not a good thing to lock up that belt...not sure of the mechanical consequences from such a thing. If you're leaking refrigerant then you popped a seal at the inlet or outlet. You probably just needed a new compressor to begin with just like I did on my fiance's Elise. Use the Toyota MR2 ('05-'09) compressor...it's only $300 new and fits the stock belt (just barely).